uuccio(at)gmail.com
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 Posted: Thu Feb 20, 2014 1:24 pm Post subject: noise problem on radio - seems to be correlated to Autopilot |
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Hello listers,
I have a noise problem on my GNS430 COM radio that's mounted on my Rotax 912
powered Kitfox. The plane only has about 30 hours on it since it was
completely rebuilt. I had not noticed this noise problem initially, only
during the last 10 hours or so.
The noise is intermittent but seems to be strongly correlated to two things
- when the Autopilot (Trio Avionics ProPilot) is switched on I get much more
noise. This noise is present even when the engine is off. It's like the
squelch breaking. For some reason I've noticed that it happens more when I
move the stick back and forth... I have no idea why this may be.
- engine RPM - when I increase the throttle the noise becomes more and seems
to increase in pitch and intensity.
I'm suspecting at least one faulty ground connection. It's possible that it
could also be due to the fact that the magneto wires (well, I'm not sure
they are real magnetos, the engine is a Rotax 912UL) are not shielded as I
didn't know any better when I wired them the first time.
(Most of the wires that come from the panel go through connectors; in this
way, I can remove the panel from the aircraft by detaching three connectors
and the wire harness to the Autopilot.).
My question is: how do I go about isolating what the fault might be? I'm
dreading having to take apart every single wire in the avionics
interconnections.
Sacha
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